300 win mag

[TC Larsen]

federal fusion, shoot it out of my Tikka 300wsm and 270.

[NORRISKI]

Try Hornady 165 grain Interbonds. My 300Win  loves them.

[Sawbuck]

I've always shot 180 grain core lokts with my 300 win mag with pretty good results, but no more. I went from an inch and a half group at 200 yards to about an eight inch pattern. I thought it was me or my gun, tried everything, couldn't get a better group. I ended up shooting a few rounds from a box that I had bought a couple years ago, and they shot great. I figured remington must be doing something different cause any of the newer boxes I've tried are not accurate at all. I tried federal premium nosler partitions and Fusion. The fusion worked great, I have been consistently getting 1 1/4" three shot groups at 200 yards. Also very happy with their performance in the field.

[Big10gauge]

Did you pull the action off the stock? If so you probably didn't tighten up the bolts to the same torque as before

[lamar_hunter]

no i havent taken it apart

[Elk-aholic]

I would start with buying some good bore solvent like Montana Extreme something that has a little ammonia in it to clear out the copper deposits, even when you clean the rifle with bore cleaner many brands only clean powder residue and leave the copper in. Try to clean it again with Butches or Montana copper solvent swab the barrel out and wait about 15min than keep running patches down until they come back totally white. I would start with a good cleaning before I tore into the scope or stock. Ive looked down barrels before that appeared totally clean but after using Montana extreme I was amazed at how much crap came out of my Sako after I just ran Hoppes solvent down the tube the Montana picked up all the copper that Hoppes left behind. The good brands cost a little more but I think you save a lot of time with cleaning in the long run, Butch's and Montana Extreme are well worth the extra money.

[Chopaka81]

Yea - what Elk-aholic said.

I remember running into a similar problem with a tried and true M700 in 270. I used Sweets 7.62 to remove the copper fouling.

On a Wby Vanguard I was even more embarrassed to find that I had a couple screws loose on the scope mounts. Think I went thru 3 boxes of handlods before finding my error.   

Hopefully you found some of the grey box Winchester ammo.

Good Luck,